DNI扰动条件下太阳能甲醇分解反应器的流量调控策略分析

Analysis on Flow Rate Regulation of Solar-driven Methanol Decomposition Reactor Under DNI Disturbance

太阳能热化学反应器实际运行性能会受DNI波动影响。本文研究了在DNI扰动下,不同流量控制策略对甲醇转化率、运行温度、太阳能-化学能转化效率等的影响规律,获得了满足催化床温度限制条件、甲醇转化率最高的优化流量调控策略。例如,当DNI从800阶跃降低至400 W·m^(-2)时,流量随之阶跃变化会使催化床温度升高至598 K,超出运行安全温度限制;而流量在60 s内斜坡降低至目标值时,满足催化床温度限制的同时甲醇转化率最高,为最优运行控制策略。

The performance of solar thermochemical reactor under actual operation is affected by DNI fluctuations.In this paper,the influences of different flow control strategies on methanol conversion rate,outlet temperature and solar-chemical energy conversion efficiency under DNI disturbance are studied.The optimal flow rate control strategy satisfying the temperature limit of the catalytic bed with high methanol conversion rate.Taking DNI step decrease from 800 to 400 W·m^(-2)as example,when the flow rate step changes to the target value,the temperature of the catalytic bed increases to 598 K,exceeding the operating safe temperature limit.When the flow rate ramp decreases to the target value within 60 s,the methanol conversion rate reaches the highest value within the permissible range of temperature,which is the optimal flow rate regulation strategy.